Sectional ladder



(No Model.)

F. 0. LOVEJOY. SEGTIONAL LADDER.

No. 461,521. Paflented 0012.20, 1891.

7 UNITED STATES PATENT OFFICE.

FREDR IC O. LOVEJOY, OF ALBANY, NEW YORK.

SECTIONAL LADDER.

SPECIFICATION forming part of Letters Patent No. 461,521, dated October20, 1891.

Application filed April 2'7, 1891. Serial No. 390,712- (No model.)

To all whom it may concern.-

Be it known that I, FREDRIO C. LovEJoY, a citizen of the United States,residing at Albany, in the county of Albany and State of New York, havein vented certain new and use ful Improvements in Sectional Ladders; andI do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

My invention relates to improvements in ladders made indetachablesections, and has for its objects to provide suitable meansfor securing the sections firmly together and for readily separatingthem when desired, and also for protecting the engaging parts fromwearing out. These objects I accomplish by the means illustrated in theaccompanying drawings, in which Figure l is a front sectional view oftwo sections of a ladder embodying my invention. Fig. 2 is aside view ofthe same, withlockingpiece detached. Fig. 3 is a view of thebearing-face of locking-piece. Fig. 4 is a plan view of the inside ofsleeve. Fig. 5 is a sectional front. View of the lower end of uppersection. Fig. 6 is a perspective view of the upper end of lower sidebar. 7 is an elevation of the fastening-bolt.

As illustrated in the accompanying drawings, A represents the side barsof the upper section of the ladder, connected together by a series ofrungs a,- and A represents the cor responding bars of the lower section,having rungs a connected therewith. The upper ends of the side bars Aare-recessed to engage with the lower rung of the upper section of theladder, and the lower ends of the bars A are also recessed to engagewith alateral projection extending outward from the side of the bars Ain line with the top rung of the lower section. This projection consistsof the end of the sleeve 0, provided with a flange o, and is preferablymade in two halves hollowed out centrally to form a socket adapted toholdthe end of the upper rung of the lower section, which rung has itsentering end reduced and provided with a shoulder, which bears againstthe flange c of the sleeve 0. The outer end of the sleeve 0 is alsohollowed out centrally to form a socket adapted to hold the head andsquare portion of the shank of an ordinary carriage-bolt D, and for thispurpose the inner walls of this end of the sleeve are made rectangular,as shown in Fig. 4. The portion of the sleeve 0 which grasps the end ofthe rung a may be provided with one or more fins c, which embedthemselves in the rung and secure a firm grasp thereon.

The threaded outer end of the bolt D engages with a screw-threadedlocking-piece E, which may be provided on its inner or bearing face witha circular groove 6, adapted to engage with a corresponding circularprojection f, formed on the bearing-plate F.

A curved lining G is formed integral with the bearing-plate F and fitsinto the recessed portion of the lowerend of the side bar A and bearsagainst the projecting end of the sleeve 0, thereby producinga lastingbearing-surface for the engaging end of the side bar A. The lining G maybe continued, if desired, so as to cover the extreme bifurcated end ofthe side bar A and be provided with vertical projections or feet H,adapted to embed themselves in the ground and prevent the lower end ofthe ladder from slipping. These feet or projections may be omitted,however, Without departing from my invention.

The upper recessed end of the lower side bar A is also provided with alining I, which is concaved in a vertical line to engage with anenlargement formed on the spool K,secured to the lower rung of the uppersection. I prefer to make this lining integral with the side plate L,which is secured to the upper end of the side bar A in any suitablemanner.

It is obvious that a ladder may have as many sections similar to thoseshown herein as may be desired.

WVhat I claim is 1. In a sectional ladder, the combination, with theoverlapping'ends of the side bars, of a flanged sleeve provided with arung-socket, a screw-threaded bolt, a bearing-plate, and a locking-pieceengaging with said bolt, substantially as shown and described.

2. In a sectional ladder, the combination, with the recessed overlappingends of the side bars, of a flanged sleeve provided with a rungsocket, ascrew-threaded bolt, a bearing-plate, a metal lining for the recessedportion of the side bars, and a locking-piece provided with a circulargroove engaging with a circular projection formed on the bearing-plate,substantially as shown and described.

3. In a sectional ladder, the combination, with the overlapping ends ofthe side bars, of a flanged sleeve composed of two similar partshollowed out centrally to form sockets for the end of a rung and thehead of a screw-threaded bolt, a threaded locking-piece, and anengaging-bolt, substantially as shown and described.

4. In a sectional ladder, the combination, with the recessed overlappingends of the side bars, of a vertically-concaved lining for said recessformed integral with a plate secured to the side of said bars, and asleeve secured to a rung and provided with an enlargement

